Statement (A) is correct. If \( \frac{1}{x} : \frac{1}{y} : \frac{1}{z} = 2 : 3 : 5 \), then the ratio \( x : y : z \) will be the inverse of these values, resulting in \( x : y : z = 15 : 10 : 6 \).
Statement (B) is also correct. If \( 4p = 6q = 9r \), we can write the ratios as \( p : q : r = 9 : 6 : 4 \).
Statement (C) is incorrect. The correct ratio \( A : B : C = 3 : 4 : 6 \) should be derived by solving the equation \( 2A = 3B = 4C \), which doesn’t lead to the given ratio.
Statement (D) is incorrect because simplifying \( P / Q : Q / R \) does not result in the ratio \( 9 : 8 : 24 \).